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In this question, we need to identify the type of triangle based on its angles. The triangle has angles of \(39^\circ\), \(50^\circ\), and \(91^\circ\).

### Explanation:
1. **Right Triangle**: A triangle with exactly one \(90^\circ\) angle.
2. **Obtuse Triangle**: A triangle with one angle greater than \(90^\circ\).
3. **Acute Triangle**: A triangle where all angles are less than \(90^\circ\).
4. **Equiangular Triangle**: A triangle where all three angles are equal, each being \(60^\circ\).

Since this triangle has one angle that is \(91^\circ\), which is greater than \(90^\circ\), it qualifies as an **obtuse triangle**.

The correct answer should be:
- **Obtuse** 

Would you like further details or have any questions?

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Here are five related questions to expand understanding:
1. What is the definition of an isosceles triangle?
2. How do you determine if a triangle is a right triangle based on its angles?
3. Can a triangle have more than one obtuse angle? Why or why not?
4. What makes a triangle equilateral?
5. How can we classify triangles based on side lengths?

**Tip:** Remember that a triangle can only have one angle above \(90^\circ\), which makes it obtuse.

Determine the type of triangle based on its angles: 39°, 50°, and 91°. This problem explores triangle classification, specifically the obtuse triangle category, using the triangle angle sum theorem. Suitable for students in Grades 6-8.

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